Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5d242d8cd5c18d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 415f5f46d01ff9f63aaefbbae8988016 SHA-1: c9ea211a2f9ec4342900b6bc144ee7a89a8d8a52 SHA-256: fb5d242d8cd5c18dbd987ff5487c87eb19f4b7ee31a5355cce3ca93c84ebe5f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, several of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kalimati.in/userfiles/file/wemezarijukepowufu.pdf In PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/40218432410.pdfIn PDF document text
    • https://eventaipei.com/upload/files/86859764398.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/bitunanawi.pdfIn PDF document text
    • http://myslizdrave.com/soubory/muzolopotilowesep.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/09e1c24d07758e1b9666a153b6981771/86091683655.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/pajukevafimadiv.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/rixepiruriwuza.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/16402326847.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/39207666344.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f061d080---nezipuwejejuvofatuwopero.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/tizoravomejokesep.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/1081679695.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/jijosidize.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/49024502138.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/rimefugunozeletemeg.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/10241396001.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338b00db869---8174904898.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/31854043207.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/93617968122.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/16342394467.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/rusuvimuxududof.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/40463081878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bahubali+1+full+movie+in+tamilPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10620 bytes
SHA-256: 9f885d824d9ae7d4f3c51d2c8a618285694a3262a78fc18502bcc1bf5034525d
font_01_sfnt_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 17844 bytes
SHA-256: 23efa07b73b78a1cb8d3490e43bab14738d43ac98a1e783c94ed2f93f5769010
font_02_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1